Examine source code of Emphfy

{
  "manifest_version": 2,
  "name": "Emphfy",
  "description": "Very Powerful Extension To Extract E-Mail ID's,Phone NUMBERS,Linkedin LINKS,Facebook LINKS and Instagram LINKS Automatically From Web Pages.Emphfy is a powerful email,phone numbers,linkedin links,facebook links and instagram links extraction extension for Chrome. Extension automatically fetches valid E-Mail ID's,Phone NUMBERS,Linkedin LINKS,Facebook LINKS and Instagram LINKS from the web page, you can copy paste particular email,phone numbers,linkedin links,facebook links and instagram links you need or export all of them to a text or CSV file. ",
  "version": "1.2",
  "author": "Aniruddhsinh Chavda",
  "icons": {
    "48": "icon38.png"
  },
  "browser_action": {
    "default_title": "Emphfy",
    "default_icon": {
      "19": "icon19.png",
      "20": "icon20.png",
      "38": "icon38.png"
    },
    "default_popup": "dashboard.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "start.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab"
  ]
}